Panll(t1) Towermax Ll(t1) For Leased Isdn And T1 Lines Rj48s. Protects Two 4wire Leased Isdn Or T1 Lines Per Module (pins 1 2 4 5 7 8 Protected). Features Autoresetting Solid State Sneak Current Protection. Use With Towermax Ksu Base Unit. Clamp Level 70 Volts.